Speed changing mechanism



Feb. 28, 1939. F. A. FRITZSCH 2,149,014

v SPEED CHANGING MECHANISM I Filed Sept. 30, 1957 5 Sheets-Sheet l kli'l M/ VIE/V702 7 Feb. 28, 1939.

F. A. FRITZSCH SPEED CHANGING MECHANISM I Filed Sept. 30, 1937 5 Sheets-Sheet 2 283 A I 282 26/ p/VVENTOP. 7 W

Feb. 28, 1939. I rrzsc 2,149,014

SPEED CHANGING MECHANISM Feb. 28, 1939. F FRITZSCH 2,149,014

S FEED CHANGING MECHANI SM Filed Sept. 50, 1937 5 SheeiS-Sheet 4 l\ 2 MIKE-N70,?! m

SPEEDS Oil-'DPIVEN MEMBER Feb. 28,1939.

F. A. FRITZSCH 7 2,149,014

SPEED CHANGING MECHANISM' Filed Sept. 30, 1957 5 Sheets-Sheet 5 |234s7b9|o TUMBLEE POSITJONS Patented Feb. 28, 1939 SPEED CHANGING MECHANISM Frank A. Fritzsch, Cincinnati, Ohio, assignor to The Lodge & Shinley Machine Tool Company, Cincinnati, Ohio, a corporation of Ohio "Application September 30,'1937, Scrial No. 166,626

.46 Claims.

My invention is exemplified in the feeding mechanism of a metal turning lathe for effecting the feeding of the tool by means of a feed. screw, also known as a lead screw, or a feed rod, or both, which have selective operative connec-v tions with the usual apron mechanism of the usual tool carriage for feeding the carriage or cross-slide, or other tool support. The lead screw is usually employed when accurate advances of the tool with relation to the rotations of the work are to be obtained, as in cutting threads, cams and the like, and the feed rod is usually employed when cutting plain, cylindrical or tapered surfaces, or performing other work in which the distance of feed per revolution of the work, or for a given measured axial distance, as an inch, is governed by the cutting resistance between the tool and the work, or the fineness of work desired,the feed rod enacting with the usual rack extending lengthwise of the bed when feeding the carriage along the bed.

The calculations prevalent in-practice in the United States when cutting threads is to desighate the axial measurement of threads as a given number i. threads per inch, and such practice is, further, to arrange the numbers of threads as advancing numbers on the indexes of lathes in which the threads are cut, as, for instance, 2, 4, 6, etc. threads per inch; and it is the practice when cutting advancing or retreating surfaces, to designate the inclination as equal to a subdivision of a measure of length or multiples thereof, for instance, in thousandths of an inch, when such designations are more desirable.

Comparing such decimal measurements with the number of threads per inch, it will be noted t'hat'the smaller the number of threads per inch the greater are the number of thousandths of van in'chwhich a tool must travel to cut an inclined surface equal to the instanced thread,

. and it such subdivisions oi decimal measureand leads in the same numerical order, namely,

from lower to higher, and it is one of the objects of myinvention to provide novel means in the feed changing mechanism to reverse the order of resultantleadvalues so that an index may be provided. on which the feed values of difierent 55 kinds or characters, for instance, threads and leads, may be arranged in numerals of increasing value in similar directions.

It is the obiect of my invention, further, to provide novel means whereby the operator is advised of the character of set-up in the feeding mechanism, as, for instance, whether it is for threads or for leads; and, further, to provide novel means whereby such means advise the operator are operatively associat with the meansfor accomplishing such change in set-up.

Such characters of. feeds, as for threads and leads, must usually be very accurate and are in-.

stanced as obtained primarily by operation of the lead screw. Tool advances by the teed rod represent another character of feed and are herein designated feeds, and in my improved device the designations of such feeds are associated with the designations of threads, so that the operator may be advised of such designations of feeds, representing feed values obtained by operation of the feed rod, in connection with the designations of threads, obtained by operation of the lead screw.

It is the object of my invention, further, to provide novel mechanism whereby to, translate the advancing values of the tool into metric measurements or other module values for different kinds or systems of feeding.

It is the object of my invention, further, to provide novel means whereby the designation of the set-up in any given system, for instance, a visual designation, is associated with interference means in the transmission mechanism, to prevent any set-up in the transmission mechanism other than that shown in the designating means; further, to provide a novel association of reversing mechanism for the feeding movement of the tool and a novel arrangement of selective feeding means acting in novel manner upon the respective set-ups in the feeding mechanism; further, to provide novel means for making such changes in the set-ups in the feeding mechanism; and, further, to provide novel means for indicating the same associated in novel manner with the speed changing mechanism.

It is the object of myinvention, further, to provide novel means for effecting speed change in a group of gears and tumbler mechanism; and, further, to provide novel means for efiecting speed change in auxiliary speed changing means, and interlocking means for the latter.

My invention consists in novel means for accomplishing the various objects stated; further,

in novel means for reversing the direction ofpower transmission through a group of gears and tumbler mechanism; further, in novel means to indicate such reversal; further, in operatively connecting such indicating means with an element of such reversal means; further, in novel means for axially and angularly moving the tumbler of a group of gears and tumbler mechanism; further, in novel speed changing means; and, further, in novel interlocking means for the same.

novel group of gears and tumbler mechanism including means for axially moving a speed change element thereof and means for angularly moving the same; and, further, in locating the operating means in a closed feed box serving as a lubricant reservoir and having handles at the outside thereof for manipulating such operating means inside the feed box for such respective axial and angular movements. whereby slots such as heretofore employed for tumbler arms and other exposed openings in the feed box are avoided to prevent the entrance thereinto of chips, dirt and other deleterious substances.

My invention consists further in providing novel means whereby a plurality of characters of feeding is obtained by rotating the group of gears and tumbler gearing in opposite directions and arranging the feed resultants of the respective characters groupwise on an indicator having operative connection with the speed changing element of the group of gears and tumbler mechanism for operating the latter in accordance with movements in the indicator to indicate corresponding tool movements; further, in providing a character indicator having operative connection with a direction control member for the-group of gears and tumbler mechanism to synchronize said indicator and said member; and, furthe in providing a transmission control member ta ontrol transmission selectively from the group of gearsand the tumbler mechanism having operative connection with said direction control member to synchronize the same.

My invention consists, further, in providing novel operatively connected indexing and operating means for the tumbler mechanism; further, in providing novel relation of speed changing means and indexing means for the same; further, in providing novel speed change means for the group of gears and tumbler mechanism,

and between the latter and the object fed. to

qualify the feeding speed when reversing direction of transmission through the group of gears and tumbler mechanism in order that the re-' sultant feeds of different values are consolidated within a narrower band; and further, in placing such resultant feeds as an index in, association /with an operating part effecting speed change.

The invention will be further readily understood from the following description and claims. and from the drawings, in which latter:

Fig. 1 is a front elevation of the head end of a lathe, partly broken away, and embodying my .invention.

Fig. 2 is a head end view of the same, partly broken away.

Fig. 3 is a longitudinal section,'showing a portion of the gearing, taken on the irregular line 3-4 of Fig. 2, and partly broken away.

Fig. 4 is a detail view of the same, taken in longitudinal section on the irregular line H of Fig. 2.

Fig. 5 is a cross-sectional view of a detail of this gearing, taken on the line 5-! of Fig. 3.

Fig. 6 is a cross-section of a portion of the My invention consists, further, in providing a gearing of my improved device and control means for the same, taken on the line 0-4 of Fig. 1, and partly broken away.

Fig. 7 is a longitudinal section of my improved device, taken in the plane of the line 1-7 of Fig. 2, and partly broken away.

Fig. 8 is a cross-section of the same, taken in the plane of the line H of Fig. 7. and partly broken away.

Fig. 9 is a cross-section of the same, taken in the plane of the line 9-9 of Fig. 7, and partly broken away.

Fig. 10 is a cross-section of the same, taken in the plane of the line Iii-ll of Fig. 7, and partly broken away.

Fig. 11 is a horizontal section of the same, taken on the line ll-Il of Fig. 1, and partly broken away.

Fig. 12 is a plan view of a portion of the gearing of my improved device, laid out in plane. and taken in the plane of the irregular line "-42 of Fig. 8, and partly broken away.

Fig; 13 is a detail view of the same, and taken in the plane of the line lL-il of Fig. 12.

Fig. 14 is a plan view of operating means for speed changes in the feed box, partly broken away.

Fig. 15 is a plan view of an exemplifying index plate for speed change control of the cone. of gears and tumbler mechanism, and

Fig. 16 is an exemplifying view of the transmission effects of the cone of gears and tumbler tool, gaged by diiferent characters of denominations, designated in the present instance as threads, feeds and leads. The bed of the lathe is represented at 21, the headstock at 2!, the feed screw at 2,3, and the feed rod at II. The feed screw is arranged to be connected with the usual half nut mechanism in the apron of the carriage, and;the feed rod is arranged to be operativeiy connected with the usual gearing in the apron connecting with the usual rack II extending lengthwise of the bed for feeding the carriage lengthwise of the work and, in usual manner, with the usual cross slide onthe carriage for cross movement of the tool. The present invention relates. however, primarily to the feeding movement of the tool lengthwise of the is shown, described and claimed in my oopending application for patent on improvement in Speed changing mechanism, Serial No. 155.072, filed July 22, 1937.

In the present exempliflcation of my invention there is a casing II, which may be termed a feed box, and may comprise a. removable wall 2|. secured to the body of the feed box by bolts ll. (Figs. 1, 2 and 7.) A shaft 32 is iournaled in a bearing 33 in the end wall of the casing at one of its ends, (Fig. 12), the other end thereof having a cup 34 keyed thereto and iournaled in abearingliin-theotherendwallflofthe casing. The shaft. the cup and the bearings are suitably held endwise in the casing.

The clutch collar 4| is operated by a lever 9i The shaft 32 has thereon gears 38, 39 and I0. (Figs. 11 and 12.) The gears 38 and 39 rotate loosely about the shaft and are held endwise with relation thereto, being spaced apart at fixed distance from each other. A clutch collar 4i is located between said gears, the clutch collar and the respective ends of the gears being provided with clutch teeth to form clutches 42, 43.

clutch collar rotates with the shaft and is slidable thereon by means of splines 44, to connect it with either of the gears 38, 39.

The gears 3t and 39 are in mesh with two of the gears of a group of diversely sized gears fit, also herein called a nest or cone of gears. The gear (it! rotates with the shaft 32, having spline connection tl therewith, and is shiftable endwise so as to be placed in mesh with one of the gears of the nest of gears or out of mesh with this nest.

A short shaft 5!, (Figs. 11 and 12) has one end thereof journaled in a bearing 52 in the cup 3% and the other end in a bearing $3 journaled in the end wall st of an extension 5d of the casing. the said shaft being held endwise in said bearings.

The cup 36 forms a clutch member fixed to said shaft. A combined clutch and gear element has a clutch face thereon which coacts with a similar clutch face on the cup to form a clutch Stand is provided with a gear til. en this combined clutch and gear element is moved in one direction, the clutch is and when it is moved in the opposite direction the gear 5? is brought into meshing relation with a gear 58 66 of a further extension 65 of the feed hon, and

extends into said clutch member. A clutch member til issplined to the feed screw and is engageable with and disengageable from the clutch member 52 to form a clutch or to. connect and disconnect the feed screw with relation to the short shaft 5i.

The gear ti is in meshing relatlon with a gear (38 on a short shaft Bil joled and held endwtse in a bearing it] in the end wall 56. The said gear 68 is fixed to said shaft at one end of said hearing. A clutch member ll of a clutch l2, is fixed tosaid shaft at the other end ofsaid hearing. This clutch also comprises a clutch member l3 splined to the feed rod 25%. The clutch member :13 is slidable lengthwise on .the feed rod to engage and disengage the clutch. e head end of the feed rod E lis journaled in a hearing it in thewall dd and extends into the clutch member ll. v

Either or both of the clutches til, it 31 he placed in clutching relation so as to place either the feed screw 23 or the feed rod it, or hoth, in train with the cone of gears mechm (Figs. 1, l and 11). A handle it is secured to a rechshaft is, in a bearing till, and has thereon an eccentric 88 located in an the clutch member tilfor moving the same axially for engagement or disengagement in the clutch all. A handle ht is fixed to a rock-shaft d5, journaled in a bearing so, and has thereon an arm, t'i provided with a suitable shoe in an annular groove 88 in the clutch element It for engaging or disengaging the feed rod 25 with ill controlled by a handle 92. (Figs. 1, 7, 10, 11 and. This lever has a shoe 93 pivoted thereon and located in an annular groove 94 in the clutch collar. A shoulder pivot pin 95 is journaled in a bearing 96, depending from the top of the easing, and is located in a bearing 91 in the lever, the lever being secured to said pin. The lever is provided with a slot iili extending lengthwise thereoflwith the walls of which a pin W2 ooacts. The pin is on a rockable hub M3, rockable in a bearing tilt in the casing, and held endwise between a shoulder M5 on the hub which engages said bearing and by having the end of the hub engage a bearing ltd in the removable wall of the casing. A rock shaft Ml is slidable endwise and rockable in the bearing W6. This shaft has spline connection it with said hub. The handle s2 is fixed to said rook shaft.

The inner end of the rock shaft is provided with a collar iii, which has a slot H2 therein lengthwise of the rock shaft, a pin lit secured in the top of the casing being received in said slot, to prevent rocking movement of the shaft while the walls of the-slot contact the pin.

When the handle 92 and the roclr shaft are moved inwardly to full extent, the walls of the slot M2 leave the pin lit free to permit rocking movement of the handle and the rock shaft.

Thereupon rocking of the rock shaft operates the.

leverhi and shifts the clutch collar iii endwise in either direction for engagement with either gear he or 39, or for being placed in neutral position between the e.

A locating pin lid threaded in the top of the casing and secured in operative position by a plug H5, has its end located in an angular slot ii iii in the hub to limit rocking movements of the hub when the clutches d2, iii! are engaged. A springpressed ball ill! resiliently held in the casing is received in any one of three notches M8 in the huh to denote neutral position and end positions respectively of the clutch collar. ill.

' A bell crank lever i126, (Figs. 7, l0 and ii), is

pivoted by a pivot pin 122 to thetop of the casing by a pivotal connection similar to'the pivotal con= nection A shoe 8'28 is pivoted to this bell crank lever and is locatedin an annular slot H2 in the hub 025 of the gear (it for shifting the gear id endwise into or out of mesh with the nest of gears.

The collar iii is provided with an arouate slot 426 in which a pin 02? at the other end of the bell crank lever is located for shifting said hall crank lever by endwise movement of the col lari it by means of the handle t2 for engaged relation or disengaged relation of the gear di l. When the handle and rock shaft are moved outwardly to full extent. a spring-pressed ball 6283 is received in a notch 529 in the rock shaft to aid in maintaining meshing relation of the gear I The handle is provided with a finger 6% (Fig. 14) adapted to register with notations A, B and C on an index till, to denote engaged relations respectively of the gear til and clutches 32, ill re-. spectively for clutched relations of the gears 3d and 8d.

It is necessary to move'the collar ill endwise inwardly out of range of the pin M3, whereby the gear th is moved out of meshing relation with the nest of gears, before it is possible to move the clutch collar ill out of neutral position, and

the clutch collar it must be in neutral position before reentry of the pin lit into the slot M2 can take place to permit endwise movement of larly into and out of meshing engagement with the rock-shaft I III to re-engage the gear 40 with the nest of gears. The structure stated forms an interlockbetween the clutch collar 4| and the gear ll to prevent both of these having simultaneous drive connection with the. nest of gears.

A tumbler shait I35 is Journaled and held end- Q wise in bearings I38 in cups I31, fixed in the end walls of the casing. (Fig. 12.) This shaft has a long gear I38 fast thereon, with which an axially and angularly movable tumbler gear I 39 meshes. The tumbler gear is mounted on a stud shaft I40, journaled in bearings I or a tumbler arm I42. The tumbler arm has a bearing I43 which is movable lengthwise on a sleeve I, the ends of which are received bearingwise about the Journal extensions I45 of the cups I31. The sleeve is provided with a slot I extending lengthwise thereof through which the tumbler gear I" reaches into mesh with the long gear I II. The sleeve rocks with the tumbler arm, and the tumbler arm moves lengthwise on the sleeve. The tumbler arm has a plate I" secured thereto. (Fig. 13), the edges of the inner end of the plate riding on the respective walls of the slot I for holding the sleeve rotatively to the tumbler arm. The tumbler arm is movable angularly so that its tumbler gear Ill may be brought into meshing relation with any 01- the gears of the nest of gears 4|, opposite which or in registry withwhich it has been placed by axial movement of the tumbler arm.

The actuating means for moving the tumbler arm respectively axially and angularly are located inside the casing while the control or operating means therefor are located outside the casing, (Figs. 1 and 2), with mere bearings and journal connections in the casing for the latter,-

whereby a closed casing is employed devoid of the usual slots or.openings accommodating an axially and angularly movable tumbler lever or other actuator for the tumbler arm, thereby protecting the inside of the casing and the mechanism therein from chips, dirt and other deleterious substances, *and keeping the inside of the casing clean. Theclosedcasingor feed box may thereby also be used as a lubricant reservoir to lubricate the operating means inside the casinz and form a suitable sump for a lubricant pump, which forces the lubricant by means 01' suitable pipes and passages to the various operating parts at the head end or t e lathe. A lubricant window I in the remo ble wall oi the casing exposes the desired level I of lubricant in the The tumbler arm ismovable angularly into operative position and into retracted position, in which latter position it is axially movable, (Figs. 7, 8, 9 and 11), the tumbler arm for convenience being provided with the riding shoe III which rides on a track It! when in-such retracted position. The tumbler arm is also provided with a lug I53, arranged to be located in any one or notches Ill, corresponding in number to the number of gears in the nest or cone of gears, for positioning the tumbler arm lengthwise of the nest of gears and iormoving the tumbler anguthe selected gear of the nest.

The notches are preferably divided, aportio thereof being on a plateIIl, the ends of which are fixed by bolts I to flanges extending inwardly from the end walls of the casing, and the other portion thereof being on a movable plate Iil, pivoted at one of its ends by a pivot II. to one or said flanges extending inwardly from one of said end walls at one end or the nest or cone of gears. The plates extend lengthwise of said nest or cone.

Movement ,of this movable plate is shown accomplished by means of an adjustable link IGI, having an adjustment I62 therein for lengthening and shortening the same, one end of said link being in the form of a reclining U member I", the said adjustment being at the lower end of said member, by means of locating nuts I" threaded over the threaded end or the lower member of said link and positioning said upper member endwise by its bearing I85 between said nuts. The lower end of this link has articulation by means of a pin I66 and bearing thereabout for articulating said link with the movable plate I51.

The other end of said link is articulated by a pin I61 with an arm I", fixed to a rock-shaft I69, journaled in a bearing I10 in the body or the casing, and a bearing III in its removable wall, and having an operating handle I12 fixed thereto, the said rock-shaft, arm and handle forming a bell crank lever. The axis of the articulation I61 is preferably moved into or beyond the plane in which the pivots oi the articulations I and I69 are located, and which is parallelwith the line of three acting to induce separation between the tumbler gear and the nest of gears, to move the link into locking position, and to hold the tumbler gear in meshing relation with the nest of gears. In such relation the rock-shaft I" is located in the recess of the reclining U-shaped member I63, thelatter having a knob I13 arranged to strike the rock-shaft when the link has been moved into connecting position.

When it is desired to change the meshing relation of the tumbler gear, the handle I1! is moved downwardly, which causes the movable plate I to move away from the plate I" and moved in the opposite direction for moving the I movable plate I51 on its pivot for engaged relation of the tumbler gear and the seating oi. the

' lug III in the proper coactive notch between the plates I, I5! for proper axial and angular location of. the tumbler arm. When the tumbler gear is in meshing relation, the parting lin b tween the plates is inclined to coniorm to the inclination of the cone of gears, so that the tumbler gear may be similarly meshed with any gear of the cone of gears. The plates hold the lug Jaw-like between them. 7

The means for moving the tumbler axially comprise an actuating arm In, (Figs. 7,8, 9 and 11), which is movable lengthwise of, the nest oi gears, and is pivoted on a pivot pin Ill extending crosswise oi the nest of gears and having a hearing I" of. the actuating arm thereabout;

the pivot pin being located in bearings I, III 7 5 tively on the body and the removable wall of the casing; The actuating arm is shown as depending in the casing and has a recess I89 in which the tumbler mechanism is received when the tumbler arm is moved into registry with the gears at one end of the nest of gears. The swinging end of the actuating arm has a shoe I9I pivotally; connected therewith, the shoe being siidabie in a slot I92 of the bearing of the tumi bier arm for converting the angular movement of the actuating arm into axial movement of the tumbler arm.

The actuating arm has a segment rack I93 fast thereon, with which a piston I 94 meshes. it This pinion is fixed to an operating shaft I95,

which is journaled in a bearing I96 on the removable wall of the casing and has an operating handle 891! connected therewith for rotating the same. (See also Figs. 1 and 2.) A springilpressed ball I98 in an arm I99 fixed bracketwise to the casing is received in locating notches 200 in the segment rack to locate the tumbler gear opposite the respective gears of the nest of gears, there being one of these notches for each axial 25 tion of the tumbler arm.

' Various of the operating devices of the feed box are mounted on theremovable wall and are arranged to be conveniently assembled with the devicm in the body of the casing when the reso movable wall is secured to the body.

The feeding values of the nest of gear and tier mechanism may be increased or modified by changing the direction of transmission therethrough, which is normally from the tumbler d5 gear to the nest of gears. The normal transmission is employed for feeding the tool by means of the lead screw to produce a given travel of the tool, for instance, lengthwise of the work, meas ured in inch measurement per revolution of the,

40 work and resulting, for instance, in the cutting of threads at given numbers of threads per inch, when employing the English or U. 8. system of measurement.- e'speed changing means for such cutting is set according to an index on which 45 the nets of threads per inch are arranged in increasing order.

The advance of the tool may also be obtained by means of the feed rod, the feed being cusmus in:- in fractions of an inch, for

5Q instance, in thousandths, per revolution of the work, the resultant feeds being noted on a corresponding index.

It is desired to also arrange the feeding mechanism so that the feed in inch measurement by 55 the lead'screw per revolution of the work is arranged on an index in decimal values, denoting ,leada. If the transmission through the nest of gears and tumbler mechanism for such latter character of feed continued to be in the same dias section, the values thereof would be arranged in reverse order tothat of the threads on the index. In order to permit the values for resultants for {the leads to be placed in increasing order on the index, similarly to the threads, the direction of g5 trasion through the nest of gears and tumbier is reversed, so that the nest of gears becomes the driver and the tumbler shaft 935 becomes the driven member of the train. g A transmitting gear 206 is flxedto the tumbler 7a shaft and meshes with the gear 58. 'Ihe clutch 56 is engaged when the transmission to the lead screw and the feed rod is in usual direction. en the transmission is in reverse direction to drive the lead screw and the feed rod from the g tumbler it as the driven member, the com- .binedclutch and gear element 551s shifted en'dwise to release its clutch and to mesh its gear 51 with the gear 58.

In order to change the direction of transmission through the nest of gears and tumbler mecha- 5 nism, the shafts 32 and I35 are in the present exempliflcation each extended to the outside of the feed box, (Figs, 2, 7, 11 and 12) and are respectively provided with gear receiving portions 201 and 208 for selectively receiving a transposable ear 209, which in either position receives its motion from a driving gear 2). The term transposable and terms of similar import as applied to the gear 209 includes the transposition of the same gear or a similar gear, or the substitution of 15 a gear of different diameter in either of said positions.

By placing the transposable gear 209 on the shaft I35, feed values of the feed screw measured in threads per inch are obtained. Feeds by the feed rod are also complemental to such thread designations, so that desired advances of the tool by the screw or by the feed rod may be readily obtained by changes in the speed changing mechanism. If decimal values of tool advance by the lead screw aredesired for leads, the transposable gear is changed to the shaft 32, whereby the direction of power is from the nest of gears to the tumblermechanism, and the gears 206, 58 and 51 to the lead screw, the resultant leads being shown in additional columns on the index in the sameorder of progression as the threads. The feed rod may also be operatively connected with this train for feed resultants.

To prevent error in setting up the machine for either threads or leads, an interference part t lt is provided which is arranged to be placed in interfering relation with the placement of the trans posable gear Add on the shaft ltd or on the shaft 32, shifting means being provided for the interference part so that it must be in interfering relation with either position of the transposable gear. This interference part is shown as a plate fixed to a rook-shaft 2 i l journaled in the'frame of the casing and provided with a spring-pressed pull pin 2 i5 engaging suitable positioning holes 2 I t in the end wall of the casing.

In order that the operator may have before him a designation showing on which shaft the transposable gear is mounted, the front wall of the extension 5d of the feed box is provided with a window til. (See also Figs. 1, 7 and 11.) The shaft 2 it extends lengthwise of the feed box, and has a collar hid fixed thereto, the collar having an apron '2 iii extending therefrom forming an indicator on which the designations of threads, feeds and leads are shown.

In the present exemplification of the mechanism when arranged for cutting according to the U. S. or English system of measurement, threads and feeds are obtained respectively by the lead screw and the feed rod, when employing the tumbler shaft as the driver, and leads are obtained by I the lead screw when employing the cone of gears as the driver. Thedesignations threads, feeds and leads are therefore so positioned and so spaced on the apron and the window is so placed andiof such height, that either the designations threads and feeds or the designation leads appear at the window to advise the operator of the internal set-up in the feed box and of the position In order that transmission from the group of gears and tumbler mechanism to the lead screw a pin! in the inside of the extension of the casing. The other end of this lever has a fork 2!! pivoted thereto, the fork being received about the gear 51 for moving the combined clutch and gear element for either engaging the clutch I when the interference part is in interfering relation with theshaft 32, or the indication of threads appears at the window 2 H, or placing itsgear in mesh with the gear 58 when the interference plate is in interfering relation with the shaft I35, or

the indication of leads appears at the window 2".

(See also Fig. 1.)

The means for shifting the shiftable element of the cone of gears and tumbler mechanism lengthwise are associated with indicating means to indicate the position of the shiftable member, instanced as the tumbler, and the feed values incident thereto. (Figs. 1, 2, 8, 9, 11, 14 and 15.) Thus there is an index 23L which in the present exempliflcation is on a wheel 23!, from which the operating handle I81 extends. It comprises an indicator, shown as a window 233, in connection therewith, the window being on a bracket 234 secured to the removable wall of the casing. and having suitable instructions on the walls of the opening therein forming the window. The index is provided with suitable columns showing, respectively, threads, feeds and leads, arranged in groups to indicate, respectively, the threads. feeds and leads obtained by the speed changes in the gearing at each position of the tumbler.

These positions are respectively indicated by the up-position of the respective numerals 1 to 10 inclusive on the front face of the wheel 232, indicative of the respective gears of the cone of gears from smallest to largest.. (Figs. 1 and 15.) Two superposed groups of feed values respectively for threads, feeds and leads, are shown in each of the columns forming the main group of numerals for the respective axial positions of the tumbler. The inner groups represent the finer feeding movements of the tool, and the outer groups represent the coarser feeding movements of the tool, obtained respectively by the selecbiezare feeding transmission hereinafter desc The numerals of the index may be on a separe operatively connected with the movable member of the index, so that movement of said movable member to obtain registry of the desired notation of speed resultant in the index also moves the shiftable member of the cone of gears and tumbler mechanism in coordinate relation for obtaining such speed resultant at the tool or other actuated part. In the present .exemp sized gears are shown as composing flcation tendiversely the cone of cone and tumbler mechanism,

gears, by means of which ten different speeds are transmitted in .one direction throughthe and these speeds are multiplied by two by changing the direction of transmission through the cone of gears mechanism.

These speeds are multiplied by three through the medium of the gears 3|, 3!, ll, selectively connected in transmitting relation with the cone of gears. These speeds may be further increased by the selective feed mechanism hereinafter described, and reversals of the feeding are obtained.

by the reversing gearing hereinafter described.

In the present exemplification, when transmitting power through the cone of gears and tumbier mechanism, using the tumbler shaft as the driver, the resultant speeds are arranged in decreasing ratio from the end of smallest diameter of the cone to the end of the largest diameter thereof, the tumbler gears being the same and the cone gears increasing in diameter, for example, from a one to one ratio decreasingly to a one to one-half ratio.

When employing the cone of gears as the driver, the resultant speeds are arranged in increasing ratio from the end of smallest diameter to the end of largest diameter of the cone, because the driving gears then increase in diam eter, whereas the tumbler gears remain the same,- the variations being from a one to one ratio increasingly to a two to one ratio.

Assuming that the tumbler shaft when driving as when cutting threads, has a speed of R. P. M., which speed is arbitrary and merfly for illustration, the range of speed of the 00 'e of gears shaft is 100 R. P. M. when-the tumbler gear is in mesh with the smallest gear of the cone, to 50 R. P. M. when the tumbler gear is in mesh with the largest gear of the cone, as shown at a in Fig. 16.

Assuming that the cone of gears shaft when driving as when cutting leads, has a speed of 100 R. P. M., the range of speed of the tumbler shaft is 100 R. P. M. when the tumbler gear is in mesh with the smallest gear of the cone to 200 R. P. M. when the tumbler gear is in mesh with the largest gear of the cone, as shown by the dotted line b in Fig. 16.

The speed resultants, when using the cone of gears as a driver, are in a higher range, than are the speed resultants, when using the tumbler shaft as a driver. In carrying out my invention I equalize the register or ranges of obtained by the transmissions in opposite directions by qualifying, that is, increasing or decreasing the delivery effect of one of said registers or rangesupon the feeding devices. In the present exempliflcation I lower the register, or reduce the altitude of the range of speed resultants in the higher range so as to conform to the height of the-range of speed resultants in the lower range, such speed resultants being instanced respectively as leads and as threads, so that their notations may be arranged within a narrower band and placed on an index, the movable member of which has operative connection with the tumbler, for moving the tumbler into relation with that gear of the cone of gears which is in cpnsonance with the selected part of the index.

I therefore introduce the speed reducing train of gears 2", l8 and 51 between the tumbler shaft and the feed screw and feed rod, this train reducing the transmitting effect of the tumbler shaft one-half when the cone of gears is the driver, resulting in a range of transmitted speed for thespeeds the tumbler shaft, in the example stated, of 50 R. P. to 100 R. P. M. of the tumbler shaft, as shown by the line c in Fig. 16, which is the same as the range of speed instanced when the tumbler shaft is the driver, but in inverse order, thereby bringing the range of leads and the range of threads, or other speed resultants, within the same band or range, for convenient arrangement on an index. which also serves as a shifter for speed change.

- This principle governs when the gear @915 in transmitting relation with one of the gears of the cone, this transmission being at a one to one ratio. It also governs when either the gear it, which is twice the size of the gear of the cone with which it meshes, or the gear til, which is one-halfthe size of the gear of the cone with which it is arranged to mesh,. are in transmitting relation with the cone.

I am thereby enabled to arrange the notations of threads and leads, or notations of other examples of speed resultants, side by side on the index of speed resultants, and to arrange these in groups about an operating wheel, or indicator 25 therefor, which exposes the selected value of speed resultants and simultaneously places the tumbler in position for proper-meshing relation to obtain the selected value.

An exemplifying index is shown in Fig. laid out in plane, and is shown on hands or strips which may be annularly arranged about the frusto-conical periphery of an index wheel. Other notations may be substituted for the notetions exemplified depending on the selected speeds and the selected examples or system of feeding, or other bands having such other notations thereon may be afixed to the index wheel.

i prefer-to drive the speed changing mechanism for the various characters of feeds from the spindle 2i, and to provide reversing means shown generally at 288, and a selective feeding transmission, shown generally at litilln novel arrangemerit between the spindle and said speed chang ing mechanism. I do not herein claim the stru'o ture of said reversing means nor of said selective feeding transmission, havingshown, described and claimed the same in my aforesaid copeiiding application, but do herein cla their associ ation with the fa means.

I The spindle 271 has a transmitting pinion 526i keyed thereto so as to rotate there th. (Figs. 2, 3 and it) This pinion meshes wltha pinion 2432 journaled by friction reducing bearings 268 on a stationary shaft 2 3 3, the ends of which are located in the head end wall are and the inner wall 266 of a lower extension 24W of the headstock. The pinion 262 meshes with a gear 268 journaled by a journal bushing 269 about a transmitting shaft 2% journaled by friction reducing bearings so 25H in the walls of the, lower extension 2H. A

reversing shaft 252 is iournaled by suitable-friction reducing bearings in the respective walls of said lower extension and has reversing pinions 2% fixed thereon. The pinion meshes as with the pinion 2432 and the pinion Zilll meshes with a gear 255 journaled by a journal bushing 22% about the shaft 2%. This rotates the gears 2419, 255 in opposite directions from'the spindle.

Transmission between said gears and the shaft to an is obtained by means of clutches 25?, 258 between said respective gears and a I clutch collar 25%), splined by splines 2th to said shaft and rotating with said shaft and movable endwise thereon. The clutch collar may be placed in intermediate 75, or neutral position so that said gears will rotate of said gears to rotate said shaft respectively in opposite directions. h

The clutch collar may be shifted by suitable means either manually, as shown and described, in my aforesaid pending application, or automatically by the carriage in usual mariner.

The means for shifting the clutch collar 25$? and thereby controlling the direction of rotation of the shaft 2% comprise a clutch'shifting fork 265 on a bearing member 256 slidable on a rod 267 fixed at its ends in the headstock. I (See also Figs. 1 and 6.) The bearing member 2% is provided with a slot 2th in which a shoe 2% carried by an arm are rides. The arm is secured to a rock shaft Eli journaled in the front wall of the headstock and provided with an operating arm 2W2 secured at one of its ends to said rock shaft at the outside of the headstock. The operating arm at its other end has adjustable articulation 2725 with one end of a rod 2141, the other end of which is suitably secured in a stud ill rotatably journaled in one end of a bell-crank lever 2% pivoted on a pin ill held in bearing lugs Elli on the extension of the feed box. The other end of the bell crank lever has articulation iiltl' with one'end of a rod M9, the rod passing through -openings in the top and bottom walls of the ex-.. tension of the feed box, and at its lower end having adjustable articulation 2th with an arm 2M fixed to an operating shaft 282. The operating shaft extends lengthwise of the bed and is jour- 'naled in a bearing 283 in said extension and in other. suitable bearings (not shown) in the carriage and bed. A suitable hand lever (not shown) may be slldably splined to the operating shaft adjacent the carriage and adapted to move with said carriage, for manually shifting the clutch collar 259 from the carriage position.

Suitable means (not shown) may be provided for automatically operating the shaft 282 when the carriage reaches either limit of its feeding movement lengthwise of the bed, or when the carriage reaches either extreme limit of its movements for preventing injury to or breakage of the parts or work.

For operating the selective feeding transmission 28%? from the reversing means 238; the-shaft 25d has a pinion 285 fast thereon at its outer end at the outside of the headstock. (Figs. 2,

2% having a friction reducing bearing 28? about a shaft flit. This shaft has friction reducing bearings tilt, 29b, in sleeves 2%, 2292 fixed in the respective walls 293, 2963 of a gear box 295 fixed as by bolts 2% to the headstock and by bolts 29? to the feed box. The sleeve list is shown fixed to the gear box by a set screw 29%. The shaft 2% also has a gear 299 thereabout having spline connection therewith." This gear rotates with the shaft and is movable endwise thereon, being positioned in its end positions by a spring pressed ball 89d, engaging notches in said shaft. The gear 299 is provided with internal teeth 3M,

forming a combined clutch and gear member,

walls of the gear box, and has a gear tilt; and

a pinion 3M7 fast thereon, the gear'being meshed by the pinion 285, and the pinion Eltl being meshed by the gear ill. When these gears and pinions are in meshing relation as shown in Fig. 3, transmission isfrom the pinion ill to the gear ill, simultaneously rotating the pinion 301, which meshes with the gear ill, having spline connection with the shaft ill for rotating said shaft at a lower speed, representing the finer threads and leads, and feeds, for the usual lead screw and usual feed rod. When the combined clutch and gear element 299, ill is moved to the right so as to engage its clutch teeth with the teeth of the pinion ill, the transmission is directfrom' said pinion to said shaft at a higher speed, representing the coarser threads and leads, and feeds, for the lead screw and feed rod, for example, respectively eight times the finer threads, leads and feeds. When said clutch is in engagement, the gear 299 is out of mesh with the pinion ill, being located in the space between thepinion ill and the gear ill, the gear ill and the pinion ill then rotating idly.

In order to move the combined clutch and gear element ill, ill endwise, the shaft ill is provided with a bore m, with which slots m' in the wall of said bore adiacent to said combined clutch and gear element communicate. A

push and pull-rod ii! is operable in said bore and is provided with an operating knob ii I, also designated a pull knob on the indicator in Fig. 14 This rod is provided with a pin iii, which is fast in the rod, and whose respective ends proiect radially in opposite directions through said 5 slots and are located in holes iii in the hub of the combined clutch and gear element ill, ill.

The pin has a threaded head ill' threaded in a threaded outer end of one of the holes iii.

' (Fig. 5.)

A hub ill of a compound change gear ill is keyed to the shaft ill so as to rotate therewith. The change gear has spline connection with the hub and is arranged to be slipped endwise of! of the same for reception of a change gear of different pitch diameter. A collar ill is releasable on the hub so as to hold'the change gear to its hub.

The change gearill with a change gear ill on a stub shaft iii flxed to a quadrant iii having a bearing iil about the Journal sleeve ill. The change gear ill has spline connection with its hub lil which has a friction reducing bearing iil about the stub shaft iii. A collar ii! is suitably releasably located on the hub to hold the change gear ill to its hub. The quadrant lii is arranged to be clamped'in different radial positions by means of. .a bolt iil in .said quadrant passing through. an arc'uate slot iii in the wall, ill of thegear box, and clamped in adiustedpositions bymeansof a nut ill threaded over said bolt. The head of the bolt is shown flat sided and locateddn 'a slot iii of the quad- ,rant to prevent turning of the bolt. The change gearillisarrangedtobeplacdinpropermesh-- ing relation with the transpos'able'gear ill in either of its positions. l

The outer end of the gear box 295 and the outerendofthefeedboxilareprovidedwith a cavity! which extends across the Joint as between said gear box and said feed box, and has therein the quadrant and the gears thereon and the gears with which said latter gears mesh,

the cavity being provided with a marginal flange ill. A cover ill covers said cavity, ,and is provided with an oppositely inwardly extending flange ill, which forms a joint with, said flrstnamed outwardly extending flange. The cover is readily removable and replaceable for conven- Bolts 340 pass through holes in said cover and are threaded into lugs extending inwardly from the flange ill to hold the cover in place. The cover is provided with inwardly extending flanges ill, ill to hold the change gears ill, ill and their hubs in place.

The screw il is usually, in United States machine shop practice, provided with a thread out according to the U. S. or English system of meas urement in inches. It may, however, be desirable to employ the metric system or other module system of measurement in measuring tool movements while employing the same screw. it this be desired by means of my improved device, an increment, constant or factor is introduced into the gearing to adapt it for such selected other system, accomplished in the present exempiifloation by substituting other pick-oil change gears, either single or multiple endwise, of diiferent diameters, for the gears ill, ill and ill, to produce the system desired. When changing from the English system of measurement to the metric ratio as minute as that representedby the constant 80 over 127, thus:

. 127 being the most minute ratio in translating" from inches to millimeters. A'suitable corresponding index may also be substituted on the wheel iii, as by providing plates similar to the plates ill but having the desired corresponding index thereon, releasably' secured to the index substituted plates being releasably held index wheel by the. screws in.

If a' screw ii, provided with a metric thread, were in the machine, a change in feeding from the metric system to the English system of measurement would be obtainable by inverting the increment, constant or factor from 80 over 127 to 127 over 80, thus:

80 in selecting the proper change gears on the centers ii I, iii and ill or ill, whereby very minute changes in gear ratios may be obtained.

The hubs of the pick-oil. change gears and their shafts at the quadrant iii are of suflicient to the length so that multiple pick-oi! change gears may. be'mounted thereon to increase the rang of speed changes permitted thereby. Since the quadrant iii has pivotal bearing on the bearing sleeve ill it may beswung in an arc whose center coincides with the axis of the shaft ill for properly positioning the pick-off gear ill or the gear substituted therefor. The quadrant may be clamped in adjusted positions. changing and substitution of other gears. single or compound, for the change gears ill, ill and ill are readily and conveniently accomplished. Odd

threads, feeds and leads may also be thus obtained wheel, the

posed groups of feed resultants; namely, threads and leads obtained by the lead screw, and feeds obtained by the feed rod. The outer groups of threads and leads, represented in the outer three cross columns of numerals on the index, (Figs. 14 and 15), are obtainable when the pull knob 3| 8 is in in position, as shown by the notation on the indicator, resulting in coarser threads and leadsby means of the selective feeding transmission 239, (Fig. 3) I and the inner groups of threads and leads, represented by the inner three cross colunms of numerals on the index, are obtainable when said pull knob is in "out position, resulting in finer threads and leads by means of said selective feeding transmission 239. The two superposed groups are separated by the dividing .line 3&5 on the index.

The groups of smaller numerical values of the "threads and the groups of larger numerical values of the leads are obtained when the pull knob is in "in position, whereby the coarser feeding of the selective feeding mechanism 239 is obtained, and these values are therefore grouped together cross columnwise, as shown by the .outer group of three cross columns A, B and C on the index.

(Figs. 14 and 15.) The groups of greater numerical values of threads and the groups of smaller numerical values of leads are obtained when the pull knob is in out position, whereby the finer feeding of the selective feeding transmission 239" is obtained, and these values are therefore grouped together cross-columnwise, as shown in the inner group of three cross columns A, B

and C on the index. (Figs. 14 and 15.) The numerical values in the respective groups increase from their outer cross columns to their inner cross columns.

The number of threads per inch are read counterclockwise in the cross columns progressively and increasingly from the groups i to it, and from the outer cross-column to the inner crosscolumn, of each group, as shown in Fig. 15, there being duplications between the groups it and 9. During the set-up for threads the tumbler shaft I35 is the driver, and the transition from the outer group of three cross-columns to the inner group of three cross-columns is uninterrupted in order. The reading of threads in groups i to Ill respectively represent the transmission effects,. of the smallest to the largest gear of the cone of gears, the speeds decreasing for obtaining increase in the reading of numbers of threads per inch.

The leads in decimals of an inch are also read in increasing numeral values counterclockwise in the respective superposed groups from i to ,i inclusive, the groups however being transposed,

the shaft 32 being then the driver and thetransmitted speeds by the cone of gears and tumbler mechanism increasing in inverse order to their order when the tumbler shaft i355 is the driver.

The numerical value of leads begin with the of the inner group at the position or group i, progress counter-clockwise annularly through said cross column, the middle cross column and the inner cross column of the inner group, and then continue annularly through the outer cross column, the middle cross column and the inner cross column of the outer group of lead values. The lead numerals progress in value throughout the respective groups.

The setting of any composite group having any desired thread or lead value obtained by the lead screw, or feed value obtained by the feed rod,

therein, so as to register with the window of the mit the speed values of said composite group.

If a thread or feed is selected, the tumbler shaft I35 is the driver, and the interference plate 2| 3 is shifted into interfering relation with the extension 287 of the shaft 32 and out of interfering relationwith its extension 208 of the shaft I35, the operator noting that the designations, threads and feeds appear at the window 287 (Fig. 1). The transposable gear 209 is placed on the extension 208 of the shaft I35 thus exposed. This shifting of the interference plate exposes the designations Threads and "Feeds at the window 2" and shifts the'combined clutch and gear element 55 to engage the clutch 56 for transmission from the shaft 32 as a van shaft to either the lead screw 23 for cutting threads, by operation of the handle 18 to close the clutch Si, or to the .This shifting of the interference plate exposes the designation Leads, at the window 2W, and shifts the combined clutch and gear element 55 to mesh its gear 57 with the gear 58, (Fig. 12), for transmission from the tumbler shaft I35 as a. driven shaft to the lead screw for cutting leads.

The appearance of the designations Threads and "Feeds or the designation Leads at the window 2i? informs the operator of the position of the interference plate M3 and compels the proper placement of the transposable gear on the respective shafts 32, E35, and informs the operator at any time of the set-up in the feeding mechanism. 1

I have herein shown and described an exemplification of my invention. It is obvious that changes in structure and arrangement of the parts and mechanisms shown and described may be made out departing from myfiinvention set forth in the following claims.

I claim:

1. In speed changing'mechahism, the combination of a plurality of shafts having speed changing means therebetween, a driving gear to be selectively transmittingly connected with said respcctive shafts for transmission in opposite directions through said speed changing means, an indicator to denote the position for said gear, and an interference part for interference with said gear controlling the position of said gear and having operative connection with said indicator.

2. In speed changing mechanism, the combination of a plurality of transmission elements having speed changing means therebetween, a transposable driving part to be selectively transmittingly connected with said respective elements for transmission in opposite directions, through saidspeed changing means, direction varying means complemental to said speed changingmeans, an indicator to indicate the position for said transposable driving part, and control means .to control said transmitting connection having operative connection with said indicator.

3. Speed changing mechanism employing a group of diversely sized gears and tumbler gear and a pair of shafts selectively operative as driving shafts to oppositely transmit power through said group of gears and tumbler gear, a transposable gear, means to selectively operatively connect said transposable gear with said respective shafts,

' said respective shafts, an indicator to indicate mit power through the selected operative connection of said transposable gear, and an' interference part to selectively obstruct operative connection of said transposable gear with said respective shafts, said interference part having operative connection with said indicator. r

5. In speed changing mechanism, the combination of a group of diversely sized gears and tumbler gear, and a pair of transmitting elements selectively operative as driving elements to oppositely transmit power through said group of gears and tumbler gear, a transposable driving member, means to selectively operatively con- -nect said transposable driving member with said respective transmitting elements, an indicator to indicate the selected operative connection of said transposable driving member, speed varying means complemental to said group of gears and tumbler gear, a releasable driving connection between the same, and an interference part to selectively obstruct operative connection of said transposable driving member with said respective transmitting elements, said interference part having operative connection with said indicator and with saidreleasable driving connection to synchronize movements of said interference part, said indicator and said releasable driving connection.

6. In feeding mechanism for a lathe adapted for feeding movements in accordance with a plurality of feeding systems, the combination of a group of diversely sized gears and tumbler gear and a pair of transmitting elements selectively, operative as driving elements to oppositely transsaid groups of gears and tumbler gear, feeding means operated thereby, speed change gearing in advance of said transmitting elements, a transposable driving member, means to selectively trausmittingly connect said transposable driving member with said speed change gearing and said respective transmitting elements, means to transmittingly connect said respective transmitting elements to said feeding means in alternation with the connection of said transposable driving member with said respective v transmitting elements, means to obtain speed change in said speed change gearing for driving said transmitting elements at selective speeds for said respective systems, and interfering means directing'selection of connection of said transposable driving member.

'1. In feeding mechanism for a lathe adapted for feeding movements in accordance with a plu- I ralityof feeding systems, the combination of a group of diversely sized gears and tumbler gear and a pair of transmitting elements selectively operative as driving elements to oppositelytransmit power through said group of gears and tumbler gear, feeding means operated thereby,

supplemental gearing including a shiftable element between one of said transmitting elements and said feeding means introducing a completherethrough,

mental feed variation, speed change gearing in advance of said transmitting elements, a transp'osable transmitting member, means to selectively transmittingly connect said transposable transmitting member with said speed change gearing and said respective transmitting elements, means to transmittingly connect said group and tumbler gear respectively to said feeding means in alternation with the connection of said transposable transmitting member with said respective transmitting elements, means to obtain speed change 'in said speed change gearing for said respective feeding systems, and interfering means for said transposable transmitting member having operative connection with said shiftable element directing selection of connection of said transposable transmitting member and consonant shifting of said shiftable element.

8. In combination, a group of diversely sized gears and tumbler gear, means including a pair of elements selective as driving members for opposite power transmission through said group of gears and tumbler gear for difierent transmission effects, supplemental gearing including a movable member to selectively transmittably connect with said groupof gears and tumbler gear for power transmission in either direction therethrough, an indicator indicating the respective transmission effects, a transposable driving element for connection with said respective driving members, and an interference member movable to interfere with operative connection of said transposable driving element with said respective driving members, said interference member, said movable member and said indicator operatively connected for combined movements.

'9. In combination, a group of diversely sized gears and tumbler gear, means including a pair of elements selective as driving members for opposite power transmission through said group of gears and tumbler gear for difierent transmission effects, an indicator indicating the respective transmission effects, a transposable transmission member for connection with said respective driving members and an interference member movable to interfere with operative connection of said transposable transmission member with said respective driving members, said interference mem-..

aid indicator to indicate the permissible connection of said interference member.

10. In lathe feeding means, the combination of a group of diversely sized gears and tumbler gear selectively driven to oppositely transmit power supplemental speed changing means including a releasable connection with said tumbler gear, a feed screw having selective operative connection with said group and said supplemental speed changing means respectively for thread cutting and for lead cutting, .a selective feeding means having materially different speed transmissions and having selective drive connection with said group and said tumbler gear respectively, an index including an indicator part on which the resultant threads and leads are angularly arranged in a plurality of groups of feed resultants, and an indicator part therefor, one of said indicator parts being rotatable and having operative connection for speed change between said group and said tumbler gear.

11. In speed changing mechanism, the combination of a movable speed change member movable into a plurality of positions for diflerent speed changes, an

her having operative connection with s index wheel having operativeconnection with said movable speed change mem-' ber to move the same for such speed changes, saidindexwheel having a frusto-conical outer peripheral face on which a plurality of series of columns of related speed resultants are provided, and an indicator to denote a given one of said series with which selective ones of said series are arranged to register by rotation of said index wheel to so move said speed change member.

12. In speed changing mechanism, the combination of a movable speed change member movable into a plurality of positions for difierent speed changes, an index wheel having operative connection with said movable speed change member for such speed changes, said index wheel having thereon a series .of grouped related speed values denoting threads and leads arranged about the axis of rotation of said index wheel, and an indicator with which the respective groups of said related speed values are arranged to register by movement of said speed change member into corresponding positions of speed value upon rotation of said index wheel.

13. In speed changing mechanism, the combination of a pair of speed change members comprising a group of diversely sized gears and a tumbler gear therefor, means for axial shifting between said members for selective position ng between said tumbler gear and the gears of said group for selective speed changes, said last-named means comprising an actuated element, an index wheel having rotative connection. with said actuated element to effect such axial shifting and having thereon a series of speed values corresponding with the speed values of the positional relations between said tumbler" gear and said gears of said group, and an indicator for said index wheel to indicate selective ones of said speed values thereon corresponding with the respective positional relations between said tumbler gear. and said gears of said group.

14. In speed changing mechanism, the combination,.of an actuated member for controlling speed change, an index wheel having operative connection with said actuated member and provided with an outer peripheral "substantially frusto-conical index face having shown thereon a series of speed values corresponding with the speed values resulting-from the positions of said actuated member, and a stationary window through which to view said selective speed values on said substantially frusto-conical index face.

15. In speed changing mechanism for feeding means to feed an operated part for selective threads, feeds and leads and comprising an operated member, an index wheel having operativeconnection with said operated member and having on its periphery a series of groups of notations of threads, feeds and leads produced by manipulation of said operated member in said speed changing mechanism, the positions of said operated member and the angular positions of said groups corresponding with each other by said operative connection, and an indicator with which said respective groups of notations register upon corresponding shifted relation of said operated member. v

16. In speed changing mechanism, the com bination of a group of diversely sized gears and a tumbler gear arranged for coaction with the respective gears of said group and including an actuated member for effecting speed changes therein, supplemental speed changing means to increase said last-named speed changes, and an index wheel having operative connection with said actuated member and provided with a series nation of a pair of increase said last-named speed changes, an index wheel having operative connection with said actuated member, said index wheel providedwith angularly arranged group of notations of speed resultants respectively obtained through actuation of said actuated member increased by manipulation in saidsupplemental speed changing means; and an indicator with which said angularly arranged groups are arranged to respectively register upon rotation of said index wheel to actuate said actuated member.

18. In speed changing mechanism, the combipower transmitting members comprising respectively a group of diversely sized gears and a tumbler gear arranged for coaction with the respective gears of said group of gears and including an actuated member effecting speed changes therein, means whereby either of said transmitting membersis constituted thev driving member of said pair to transmit diiferent characters of speed values through the other member of said pair as a driven member, and an index wheel having operative connection with said actuated member and provided with angularly arranged groups 01- said diiferent charac ters of speed values angularly positioned in re-- lation to the actuated positions of said actuated member to produce said respective speed values. changing mechanism, the combi nation of a group of diversely sized gears, a tum- 19. In speed bler device including atumbler gear arranged to mesh with the respective gears of said group, means for shifting said tumbler device lengthwise of said group independent of said lastnamed means and a bar to place said tumbler gear in the plane of any selected gear of said group, provided with locating parts coacting with said tumbler device, said locating parts arranged stepwise in coordination with the stepwise arrangement of said diversely sized gears when said-bar is in position for meshing of said tumbler gear, and means to move said bar toward said group whereby to move said locating parts collectively to shift said tumbler gear into meshing relation with said selected gear.-

20.' In speed changing mechanism, the combination of a group of diversely sized gears, a tumbler device includinga tumbler gear arranged to mesh with the respective gears of said group, means for shifting said tumbler device lengthwise of said group to locate said tumbler gear in the plane of any selected gear of said group, and a movablebar provided with locating parts ar- I ranged stepwise coordinately with the stepwise arrangement of the diversely sized gears of said group when said bar is in position for meshing of said tumbler gear and coacting respectively with said tumbler device in its various shifted positions for moving said tumbler device to mesh said tumbler gear with the selected gear of said group.

21. In speed changing mechanism, the combination of a cone of gears, an axially and angularly movable tumbler arm, a tumbler gear thereon movable opposite any selected gear of said selected ones of said gears of cone by axial movement of said tumbler arm, a bar pivoted adjacent to one end of said cone, said bar and said tumbler arm provided with coacting locating parts to locate said tumbler gear in the respective planes of said selected gears, and moving means for pivotally moving said bar to angulariy move said tumbler arm for meshing relations of said tumbler gear with the respective gears of said cone.

22. In speed changing mechanism, the combination of a cone of gears, an axially and angularly movable tumbler arm and tumbler gear thereon meshable with the respective gears of said cone, a bar pivoted adjacent to one end of said cone, a companion bar therefor, said tumbler arm having a locating part, said bar provided with coactive locating parts for the latter to selectively position said tumbler gear opposite selected ones of said gears of said cone, and means for pivotally moving said pivoted bar to locate said first-named locating part between said coactive locating parts.

23. In speed changing mechanism, the combination of a cone of gears, an axially and angularly movable tumblerarm and tumbler gear thereon meshable with the respective gears of said cone, a bar pivoted adjacent to one end of said cone, a companion bar therefor, said tumbler arm having a locating part, said bars provided with coactive locating parts for the latter to selectively position said tumbler gear opposite said cone, means for pivotally moving said pivoted bar to locate said first-named locating part between said coactive locating parts, and a track for said tumbier arm along which to axially move said tumbler arm.

24- In speed changing mechanism, the combination of a cone of gears, an axially and angularly movable tumbler arm and tumbler gear thereon meshable with the respective gears of said cone, an operating bar to angularlyirnove said tumbler arm, and a toggle link to" operate said bar and movable into locking irelatlon upon meshing position oi said tumbler ean- 25. In speed changing mechanism, the combination of a cone of gears, an axially and angularly movable tumbler arm and tumbler gear thereon meshable with the respective gears of said cone, an operating bar to angularly move said tumbler arm, a toggle link to operate said bar and movable into locking relation upon meshing position of said tumbler gear, and a spring acting on said toggle link to normally urge the same into such locking relation.

26. In speed changing mechanism, the combination of a cone of gears, an axially movable coacting tumbler gear therefor, an arm movable lengthwise of said cone on a pivot extending crosswise of said cone and having operative connection with said tumbler gear to axially move the same opposite any selected gear of said cone, and an index comprising a movable index part having operative connection with said arm to ivotaily move said arm and thereby so axially move said tumbler gear lengthwise of said cone for measured distances corresponding with the indicating values of said movable index part.-

27. In speed changing mechanism, the combination of a cone of gears, an axially movable coacting tumbler gear therefor, an arm movable lengthwise of said cone on a pivot extending crosswise of said cone, said arm having operative connection with said tumbler gear to axially move the same, said arm provided with a rack extending lengthwise of said cone, and an index any selected gear of comprising a movable index part having gear I connection with said rack to pivotally move said arm and thereby axially move said tumbler gear lengthwise of said cone for measured distances corresponding with the indicating values of said movable index part.

28. In speed changing mechanism, the combination of a cone of gears, a tumbler arm and a tumbler gear thereon movable axially for placement' opposite any selected gear of said cone; 9. pivoted arm movable lengthwise of said cone on a pivot extending crosswise of said cone and having operative connection with said tumbler arm for such placements, a track extending lengthwise of said cone on which said tumbler arm is movable axially when in retracted position, means to move said tumbler arm angularly different distances in difierent axial positions of the same for meshing relation of said tumbler gear with the respective gears of said cone, an operating handle, and means operated thereby having operative connection with said tumbler arm to move said tumbler arm such difierent distances by movements of said operating handle one operating distance.

29. In speed changing mechanism, the combination of a cone of gears, a tumbler arm and a tumbler gear thereon movable axially opposite said cone and retractable different angular distances from meshing relation of said tumbler gear with the respective gears of said cone, and an operating handle and means operated thereby having operative connections with said tumbler arm arranged stepwise lengthwise of the cone in coordination with the stepwise arrangement of the gears oi said cone when in actuated position for tumbler gear engagement with the respective gears of said cone and thereby to operate said tumbler arm different angular distances for meshing relations of said tumbler gear with the respective gears of said cone by moving said operating handle a single distance.

30. In speed changing mechanism, the combination of a cone of gears, a tumbler arm and a tumbler gear thereon movable axially opposite any selected gear of said cone and movable different angular distances for meshing relation of said tumbler gear with the respective gears of said cone, an operating handle and an operated part operated by said handle and having stepwise connections with said tumbler arm coordinated with the steps of the gears of said cone, whereby said handle is movable a single distance for moving said tumbler arm and said tumbler gear said different angular distances.

31. In speed changing mechanism, the combination of a cone of gears, a tumbler arm and a tumbler gear thereon movable axially opposite any selected gear of said cone, and a lever having its pivot adjacent to the end of larger diameter of said cone and extending lengthwise of said cone, said lever coacting with said tumbler arm at the different axial positions of the latter for moving the latter different angular distances at said different axial positions for meshing relation of said tumbler gear with the respective gears of said cone.

' 32. In speed changing mechanism, the combiment of said cone levers at different lengthwise positions of said handle.

33. In speed changing mechanism, the combination of a. pair of shiftable power transmitting elements, a plain leverand a bell crank lever respectively having operative connections with said 9 respective elements for shifting the same, an axially movable and rotative shaft, a collar on said shaft having operative connections with said bell crank lever and movable endwise with said shaft to operate said bell crank lever, locking means to hold said collar non-rotative during such endwise movement and releasable from said collar at the end of such endwise movement for rotative movement stationary collar rotatable with said shaft and having operative connection with said plain lever to operate said plain lever, whereby said respective levers are operable at different axial positions of said shaft, and a single handle for axially and rotatively moving said shaft.

34. In speed changing mechanism, the combi-' nation of a cone of gears, a tumbler arm and a tumbler gear on said tumbler arm, a pivoted arm having a pivot crosswise of said cone and pivotally movable lengthwise of said cone and having operative connection with said tumbler arm to translate said tumbler arm into various positions for registry of said tumbler gear with the respective gears of said cone, a lever having its pivot adjacent to the end of larger diameter of said cone and extending lengthwise of said cone and coactive along its length with said tumbler arm at the various registry positions of said tumbler arm, a closed gear box in which all said parts are mounted and a pair of shafts journaled in the closed wall of said gear box, one of said shafts provided with a handle outside said closed gear box and operative connection inside said closed gear box with-said pivoted arm, and the other of said shafts provided with a handle outside said closed gear box and operative connection inside said closed gear box wlth .said lever. 35. In combination, a coneof gears and tumbler mechanism, means for transmitting power therethrough in opposite directions and an index of speed resultants obtained thereby comprising a rotatable member, said rotatable member having operative connection with the movable eleofgears and tumbler mechamovable element by said rospeed changes in consonance of speed resultants of said nism to shift said tation for selective with the notations index. a v

36. In combination, a cone of gears, an axially shiftable tumbler coacting therewith, anindex of speed resultants comprising a rotatable member rotatable for indicating a selected speed resultant and having operative connection with said shiftable tumbler to shift said tumbler by'said rotation axially into the speed transmission position relatively to said cone of gears to produce said selected speed resultant, and means to angularly shift said tumbler for power transmission.

37. In combination, a cone of gears and a tumbler coacting therewith forming apair of transmission members, one of which is axially shiftable, an index of speed resultants comprising a rotatable member rotatable for indicating a selected speed resultant and having operative connection with said axially shiftable transmission member to shift the same by said rotation axially into the speed transmission position relatively tothe other of said members to produce said selected speed resultant, and means to anguofsaid shaft, a lengthwise larly shift one of said members for power transmission between said member a 38. In combination, a cone of gears and a coacting tumbler which are selectively driven for powertransmission therethrough in opposite directions, a feeding element driven thereby selec-' tively, and supplemental speed reducing means between said tumbler and said feeding element effective when said cone of gears is the driver to lower the register of the range of speeds imparted to said. feeding element whereby to more closely relate the ranges of speeds resulting from said power transmissions in opposite directions for placement of notations of resultants of said speeds on an index, and said index having operative con-.

nection with said tumbler to shift said, tumbler in.

consonance with given ones of said notations.

39. In combination, a cone of gears and tumbler mechanism, means for power transmission therethrough in opposite directions, a feeding member operated thereby in each of said directions, a speed reducing train between the tumbler portion of the mechanism and said feeding member to substantially equalize the transmitting effects upon said feeding member in both said directions whereby to produce a subtsantially equal range of speed resultants of different kinds, and an index'of said speed resultants of different kinds comprising a movable member, said movable member having operative connection in accordance with the notations of said speed resultants of different kinds of said index.

40. In combination, a cone of gears and tumbler mechanism, supplemental speed changing -means therefor, means for power transmission in oppo -site directions through said cone of gears and with the notations of said speed resultants of different kinds of said index.

41. In combination, a cone of gears and a tumbler coacting therewith forming apair of transmission members, one of which is axially shiftable, means for power transmission therethrough in opposite directions for delivery resultants of different kinds, a power delivering speed qualifying train operated by one of said members to substantially equalize the delivery resultants of both said members, and an index of such plurality of delivery resultants arranged groupwise comprising arotatable member, said rotatable member having operative connection with said axially shiftable transmission member to shift the same by its rotation in accordance with the notations of such delivery resultants of saidindex;

a cone of gears and a tumbler coacting therewith forming a' pair of 42. In combination,

transmission members, one of which is axially shiftable, means for power transmission therethrough in opposite directions for delivery resultants of different speed qualifying train operated by one of said -30 with the axially shiftable member of said cone of gears and tumbler mechanism to shift the same kinds, a power delivering through in opposite directions for delivery re- 7 the same by its rotation in accordance with the 45. In speed changing mechanism, the combi- "nation of a closed casing, a cone of gears, a tumbler arm and a tumbler gear on the latter in said closed casing, operated means in said closed casing to shift said tumbler arm lengthwise of said cone for location of said tumbler gear opposite any gear of said cone, operated means in said closed casing to angularly move said tumbler arm for meshing relation 01' said tumbler gear with thelrespective gears of said cone by movement of said operated means a single distance, an operating shaft journaled in the wall of said closed casing for each of said operated means, and operating means outside said casing for each of said operating shaits, whereby to place said cone of gears, tumbler arm and tumbler gear and said operated means wholly inside said closed casing and to operate the same solely by means of operating shafts journaled in the walls of said closed casing. a

46. In combination, a cone of gears and a tumbler coacting therewith forming a pair of transmission members, one of which is axially shiftable for speed change, driving means selectively for'said cone of gears and said tumbler for r a power transmission therethrough in opposite di- 44. In combination, a cone of gears and a rections,a selective speed transmission for said tumbler coacting therewith forming a pair of driving means for selective higher and lower transmission members, one, of which is axially ,transmission speeds thereof, whereby various shiftable, supplemental speed changing means superposed groups of delivered speeds by; said therefor, means for power transmission through cone of gears and tumbler respectively as drivers said cone and tumbler in opposite directions for are produced, and an index of speed resultants delivery resultants of different kinds, said dein said respective groups including groups of livery resultants being based on different speeds speed resultants in one of said directions inversely of transmission, superposed, said index including a rotatable and an index of such delivery" resultants arranged in groups respectively based member to indicate said respective groups and having operative connection with said shiftable on diiierent speeds each containing such speed resultants of different kinds, said index commember to shift the same into the speed transprising a movable member having operative conmission position denoted by said respective groups nection with said axially shiftable member to, of the indicator. shift the same in accordance with the positions oi said respective groups in said index.

members to substantially equalize the delivery resultants of both said members, and an index of such plurality oi! delivery resultants arranged groupwise with corresponding delivery resultants each kind in said respective groups, said index comprising a rotatable member, said rotatable member having operative connection with said axially shiitable transmission member to shift positions oi. said groups of delivery resultants on said index.

43. In combination,

a cone of gears and a tumbler coacting therewith forming a pair of transmission members, one of which is axially shittable, means for power transmission'theresultants of different kinds, said delivery resultants being basedion different speeds o! transmission, and an index of such delivery resultants arranged in groupsrespectively based on diflerent speeds each containing such speedresultants oi difierent kinds, said index comprising a movable member having operative connection with said axially shiitable member to shift the same inaccordance with the positions of said respective groups in said index.

FRANK A. FRITZSCH.

CERTIFICATE OF- CORRECTION. February 28, 1959'.

FRANK A. FRITZSCH. v

the printed specification Patent No. 2,1n9,o1t,.

It is hereby certified that error appears in of the above numbered patent requiring correction as follows: Page 5, second column, line 5h, for the wor'd "ball" readpbell; page 5, first column, line li for "piston" read piniom page ll, second column, lines M1,, b5, b6 and 11,? inclusive, claim l9,str'ike out "independent of said last-named means and a bar to place said tumbler gear in the plane of any selected gear of to place said tumbler gearinthe plane of a bar independent of said last-named means for "connections" read consaid group," and insert instead any selected gear of said group, and; page 15, first column, line 9, claim 55, nection; and that the said Letters Patent shouldbe read wlththis correction therein that the some may conform to the record of the case in the Patent Office. a r

Signed and sealed this nth day of April, A; D. 1959.

Henry Van Arsdale '(Seal) Acting Commissioner of Patents. 

